Intellectual property — as embodied in copyright and patent — was the subject of intense debate within Liberty.
Benjamin Tucker flatly rejected the idea that legal copyright was
compatible with anarchism. The strength of Tucker's opposition to
patents may be judged from his essay "State Socialism and Anarchism: How
Far They Agree, and Wherein They Differ." Here, Tucker explained the
key difference between individualist anarchism's position on
intellectual property and that of the major competing radical school of
his day — state socialism:

"The two principles … are AUTHORITY and LIBERTY, and the names of the
two schools of Socialistic thought which fully and unreservedly
represent one or the other of them are, respectively, State Socialism
and Anarchism."